"Soon after horrific natural gas explosions killed five people in Allentown and a utility worker in Philadelphia, a Pennsylvania congressman called a hearing in March to talk about improving pipeline safety. Right away, U.S. Rep. Bill Shuster made one thing clear: He wasn't sure the solution was more federal inspectors, or even a more powerful U.S. pipeline safety agency with tougher regulations."

"Is the U.S. leading or blocking progress toward stopping global warming? It's a key question this week as officials from more than 190 countries begin the latest round of negotiations seeking an eventual global climate-protection plan."

"VANCOUVER -- A Canadian environmental organization has launched a new automated system to draw public attention to the number and size of the oil tankers that transit Vancouver's Burrard Inlet."

"Republicans have been attacking environmental regulations, arguing that they hurt the economy and that the costs outweigh the benefits. But four decades of data show they are wrong."

"France's state energy firm EDF has been fined €1.5m by a Paris court for spying on Greenpeace."

"Thousands of protesters opposed to a new oil pipeline from Canada to the United States circled the White House grounds on Sunday to press President Barack Obama to reject the project for environmental reasons.

Opponents to TransCanada Corp's Keystone XL pipeline, which would transport crude produced from oil sands, have dogged the president for months, arguing that the carbon emissions produced in the process of extracting oil from the sands would exacerbate climate change.

A car struck three "Occupy DC" protestors blocking traffic outside an event at the DC Convention Center, where two GOP presidential candidates were honoring the anti-environmental Koch brothers. The protestors were ticketed for blocking traffic and sent to the emergency room, while the driver who struck them was not charged. Accounts of the incident differed. Protestors said the driver sped up to plow through two different sets of protestors. Police said that the protestors jumped in front of a moving car and that they released the driver because he had a green light when he hit them.

"The Federal Bureau of Investigation (FBI) says that four members of a fringe militia used a book written by Fox News 'expert' Mike Vanderboegh as a basis for a plot to commit domestic terrorism. Federal law enforcement authorities on Tuesday arrested four Georgia senior citizens for allegedly plotting to kill government officials and spread terror with guns, explosives and the toxin ricin."

"NEW YORK -- Environmental activists spent the weekend here trying to push their issues to the forefront of the Occupy Wall Street movement, staging mini-protests in the shadow of the World Trade Center on everything from relicensing the Indian Point nuclear power plant to hydraulic fracturing to global water scarcity.

"Hollywood legend Robert Redford has starred in his second anti-Keystone video in less than two weeks. And this time he is advocating encircling (not occupying) the White House on November 6 to show President Barack Obama the 'people's' opposition to TransCanada's $7-billion pipeline.

"An agricultural leader protesting illegal deforestation was shot to death in northern Brazil, the eighth environmentalist farmer to be killed since May in the Amazon, activists said Tuesday."

Clyde Butcher, a photographer who lives in the Everglades, uses his nature photographs to support calls for conservation. He's a member of the International League of Conservation Photographers, who address issues ranging from poaching to global warming.

"A former police spymaster who spent years living deep undercover in the protest movement has confessed he tricked an innocent woman into having a long-term relationship with him, as part of an elaborate attempt to lend 'credibility' to his alter ego."

"Nonprofit conservation groups have preserved tens of thousands of acres of land in California – wild places where both hikers and animals roam. Now, some of them say the economic slump could force them to scale back."

Green climate activists have declared their solidarity with the "Occupy Wall Street" movement.